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Use an Hyperfine structure file, described in File.hfs to fit the velocity re-aligned, integrated spectrum. The corresponding hyperfine structure is stored in SIC structure HFS%. The optional argument Opacity can be used to specify the total opacity (sum over the hyperfine components), the default being 0.1. If Opacity is negative, the opacity is then adjusted by the profile fitting procedure, using -Opacity as starting value.
Fit results are available in SIC structure G_%...